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Do some ISPs bar access to smtp except from clients/<dial-up>?

From no.top.post@gmail.com
Newsgroups comp.os.linux.networking, comp.mail.misc
Subject Do some ISPs bar access to smtp except from clients/<dial-up>?
Date 2012-10-05 14:53 +0000
Organization A noiseless patient Spider
Message-ID <k4msa1$bip$1@dont-email.me> (permalink)

Cross-posted to 2 groups.

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Here's the diagram instead of a thousnad words.

Me -> FixedRadioModem -> ISP2 -> Internet
  http == OK
  Usenet == OK
  telnet ..etc == OK

ISP2 ->
   pop=fail  : wrong ID/paswrd
   smtp=fail : wrong ID/paswrd

NB.
Me -> FixedRadioModem -> ISP2 -> Internet -> ISP1
  pop:ID1 == OK
  pop:ID2 == OK
  smtp:ID1 == see telnet log below
  smtp:ID2 == see telnet log below
--------------------------

Apart from the general increase in crime & corruption, here is South Africa,
there seems to be a war on between ISPs.

Previously I had dialup to ISP1 for 2 email accounts.

Then they introduced <Transmit Authorisation> and I had to 
modify my mail client.

Then some years later I could not send to my gmail account, although I
was able to send and recieve between the 2 different accounts, on
the same ISP1.

Could this be explained by Transmit Authorisation not allowing
the mail to EXIT the smtp, although it could transfer WITHIN the
same 'domain'; ie. within the ISP.

Now I can't even communicate between the 2 in the same-ISP.
Although both pops receive from my gmail -- http-based.

Presently I can access gmail from ISP2

Here's a telnet trace to ISP1, via the fixedRadioModen of ISP2:----
spawn telnet smtp.absamail.co.za 25
Trying 196.41.6.142...
Connected to smtp.absamail.co.za.
Escape character is '^]'.
220 smtp.absamail.co.za ESMTP
ehlo
501 #5.0.0 EHLO requires domain address
AUTH LOGIN
334 ********
*******************
334 ***********************
*****
235 #2.0.0 OK Authenticated  <-----*!
DATA
503 #5.5.1 MAIL first
MAIL FROM:<crgl***@absamail.co.za>
250 sender <crgl***@absamail.co.za> ok
RCPT TO:<eas***@absamail.co.za>
250 recipient <eas***@absamail.co.za> ok
DATA
354 go ahead
Date: Sept 3012
Subject: tst2 expect Ac2Ae2

Line after space-line separator
line-2
line-3
line-4
.
250 ok:  Message 910133084 accepted    <---- *!
quit
221 smtp.absamail.co.za
Connection closed by foreign host.

---------------- end of telnet session trace:-----------

So the smtp indicates "Message 910133084 accepted", but
"RCPT TO:" doesn't receive any thing.
Although "RCPT TO:" receives from my gmail..etc.
----------------

ISP2 [Neotel/neomail] admits that their email is not-working
and will be fixed real-soon-now;  for the last 6 weeks.

The help-line's recorded message of ISP1 advises to use:
 smtp.atlantic.net

which telnet-traces as follows :--------
spawn telnet smtp.atlantic.net 25
Trying 69.28.75.82...
Connected to smtp.atlantic.net.
Escape character is '^]'.
220 smtp-1.atlantic.net ESMTP
ehlo
250-smtp-1.atlantic.net
250-PIPELINING
250-8BITMIME
250-SIZE 33554432
250 AUTH LOGIN PLAIN
AUTH PLAIN
334
easlab@absamail.co.za
501 malformed auth input (#5.5.4) <-------------* !
---------------------

I don't want to waste effort on the RFC to see if/how to get past
the TxAuthorisation, because the help-line live-person of ISP1 says
"you need to contact ISP2 for you smtp".
And then she says the change to smtp.atlantic.net is only for FUTURE.

I'm speculating that ISP1 could previously accept smtp input via the
general-internet, but due to <problems>, it's now been set-up to ONLY
receive input from its clients, ie. via dial-up [ISDL ? is it called today].

Would this be a possible explanation?

The whole confusion coincided with plenty spam-mails from Japan and
ISP1 having a new Macphee [an Intel corp] absurdly-http-based facility 
to manage-your-spam.

If via ISP2's fixedRadioModem, I can:
ISP1:pop, 
ISP1: telnet : smtp: as per log above, but the mail is NOT delivered,
http, USEnet ..etc. is OK,
then why would ISP2's pop & smtp be out of order for weeks?

Is there something special happening with global email, these last few month?


== TIA.

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Thread

Do some ISPs bar access to smtp except from clients/<dial-up>? no.top.post@gmail.com - 2012-10-05 14:53 +0000
  Re: Do some ISPs bar access to smtp except from clients/<dial-up>? Whiskers <catwheezel@operamail.com> - 2012-10-05 19:44 +0000
    Re: Do some ISPs bar access to smtp except from clients/<dial-up>? no.top.post@gmail.com - 2012-10-07 12:00 +0000
      Re: Do some ISPs bar access to smtp except from clients/<dial-up>? "Thor Kottelin" <thor@anta.net> - 2012-10-07 15:10 +0300
        Re: Do some ISPs bar access to smtp except from clients/<dial-up>? Whiskers <catwheezel@operamail.com> - 2012-10-07 13:21 +0000
  Re: Do some ISPs bar access to smtp except from clients/<dial-up>? Steve Baker <bakesph@comcast.net> - 2012-10-05 15:53 -0400
    Re: Do some ISPs bar access to smtp except from clients/<dial-up>? no.top.post@gmail.com - 2012-10-07 12:01 +0000

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